Though you may get to ledgers and accounts through other menu icons like Home, it's convenient to put all money affairs here as well.  Financial statements, bank statements, Visa bills, etc will be sent here in order to be saved and to update various running ledgers.  When you buy  something, receipts will be sent here, and ledgers, will be updated automatically.  Investments, planning, all the finacial aspects of your life will revolve around this very private website.